$$(2a-b)^{2}-(a-2b)^{2}$$
$3\left(a^{2}-b^{2}\right)$
$$4a^{2}-4ab+b^{2}-\left(a-2b\right)^{2}$$
$$4a^{2}-4ab+b^{2}-\left(a^{2}-4ab+4b^{2}\right)$$
$$4a^{2}-4ab+b^{2}-a^{2}+4ab-4b^{2}$$
$$3a^{2}-4ab+b^{2}+4ab-4b^{2}$$
$$3a^{2}+b^{2}-4b^{2}$$
$$3a^{2}-3b^{2}$$
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$3a^{2}-3b^{2}$
